Keystones — Capstone
Five GCSE retrieval questions · 11 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 11
Answer: 2(x - 6)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 202.84cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 16:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 21, 72, 40, 79, 51, 96, 57, 86. Give your answer to 2 decimal places
Answer: Mean = 58.56, Median = 57, Range = 75